Meaning

noun any act of immoderate indulgence

noun secret rite in the cults of ancient Greek or Roman deities involving singing and dancing and drinking and sexual activity

noun a wild gathering involving excessive drinking and promiscuity

originOriginally in plural from French orgies, from Latin orgia, from Ancient Greek ὄργια (órgia, “secret rites, mysteries”).

Etymology from Wiktionary, CC BY-SA 3.0